2022+ Honda Civic SI/Sport BIG
MOUTH Lit Kit Installation Guide
Please review this document before attempting installation.
You will need basic hand tools and 2 hours of installation time.
Kit Contents (Full Kit)
Please review the table below and make sure you have received the kit contents.
Kit Contents (LIT Flare Only)
If you already own the Velossa Tech Civic SI BIG MOUTH, skip to slide 10 to see
install and wiring instructions.
Kit Contents Qty
Diode Dynamics RGBW Controller 1
Positive Cable w/ In-Line Fuse 1
Power Cable w/ Pigtail Connector
1
Switch
1
Switch Ground Cable w/ Crimped Connector
1
8" Zip Ties 8
Cable Clip
2
Assembled LIT KIT BIG MOUTH 1
Driver Side Hole Location
Remove the stock shroud to allow for installation of the Big Mouth.
Hold on to the pop-up retainer clips that retain the shroud. An
OEM retainer clip will be used later to install the Big Mouth.
Remove Stock Components
Remove the indicated air intake assembly by undoing the indicated bolts
and plastic push clip.
Remove Stock Components
Loosen (no need to remove) the indicated bolts just enough to allow the section
of frame to flex (left). Position the Big Mouth such that the round protrusion
lines up with the hole in the section of frame (right).
Big Mouth Installation
Use the supplied M6 x 40mm cap screw and OEM retainer push clip to fasten the Big
Mouth at the shown locations. DO NOT OVERTORQUE.
Big Mouth Installation
Use the supplied #8 screw and fender washer to fasten the Big Mouth from the top.
DO NOT OVERTORQUE.
Big Mouth Installation
Once the Big Mouth has been fastened through all 3 points, re-attach the section of
frame and stock air intake components that were removed/loosened prior to install.
The Big Mouth should feel sturdy and free of any interference.
Attach the supplied cable clip to your BIG MOUTH as shown. Fasten the cable and provide
enough slack to not strain the cable.
Install the LIT BIG MOUTH Flare
SKIP THIS SLIDE IF YOU PURCHASED A FULL LIT KIT
Attach the 3M cable clip here
If you purchased a LIT flare-only and
already have a Gen 4 BIG MOUTH.
Remove old flare and install the LIT
flare with the 4 screws as shown.
Wiring Harness
Crimped connectors
Power terminal (+) In-line fuse
Toggle switch
Ground terminal (-)
Switch ground wire
Crimped connector
Power connector
Positive wire (+)
Ground wire (-)
Wiring Harness Schematic
Ground (-)
Switch (leave on)
Fuse
12V Power
Terminal (+)
Crimped connector to
switch terminal (+)
Gold terminal can be grounded using the
wire shown below to allow switch LED to
light up when in use.
Crimped connector to
switch terminal (A)
Power connector
There is an extra black wire in your kit, you
can use it to ground the switch gold terminal
if preferred, however not mandatory.
Route the LED strip cable through the indicated opening.
Big Mouth Wiring
Undo the indicated bolt to fasten both black ground wires to the
ground location shown below.
Big Mouth Wiring
Controller Location
Clean the surface with a dry cloth and use the provided double-sided tape to adhere the
Diode Dynamics controller to the shown location. Connect the LED strip to one of the
controller ports (line up the arrows on the connectors!). The other 3 ports can accept
any Diode Dynamics lighting strip for underglow or underhood lighting (sold separately).
Adhere the controller
to this flat surface
Big Mouth Wiring
Connect the grey pigtail connector to the controller. Route the red wire from the pigtail
connector around the fuse box and towards the battery as shown. Bundle most of the red
wire together using one of the supplied zip ties while reserving ~6” of wire for the next
connection.
Big Mouth Wiring
Follow the wiring harness schematic (slide 12) to properly hook up the
switch. Bundle the excess wire as shown and reserve ~12” of red wire for the
next connection.
Big Mouth Wiring
Secure the switch to the wire loom using one of the supplied zip ties and
conceal the bundles of wire in the crevice shown below. Be careful not to
subject any wires or connectors to strain.
Exercise strain relief!
Hide bundles of wire
Zip tie
Use the car battery to supply power to the Lit Kit. Undo the nut located on the
positive terminal of the battery and fasten the power cable to it as shown. Take
care to avoid damaging the wire when reinstalling the terminal cover.
Use any leftover zip ties and cable clips to organize and conceal any excess wire.
Conceal and organize
the excess wire
Big Mouth Wiring
Fasten to power terminal Do not crush wire with cover
Download the Diode Dynamics app and connect via Bluetooth.
Phone App
How to connect to the app:
1. After installing the app from the app store, open the app on
your device.
2. Cycle the power to the Bluetooth controller by unplugging it
and plugging it back in or flick the power switch and wait a
few seconds, then turn it back on.
3. Wait for the app to detect the controller, it will pop up on
the app screen as a Bluetooth controller. If necessary, cycle
the power once more to refresh the controller.
4. Once the controller shows up on the app, click it and
connect. You have 30 seconds to select the controller once it
shows up on the app. After 30 second you will need to
refresh again to detect the controller again.
5. Note that if you mounted your controller behind a lot of
metal components, this may degrade the signal and range.
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